<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>JD2</title>
    <style>
        * {
            padding: 0;
            margin: 0;
        }

        box {
            width: 20px;
        }

        li:hover {
            background-color: #d9d9d9;
        }

        li {
            padding-left: 10px;
        }

        a {
            color: black;

            text-decoration: none;
            color: #333333;
        }

        li a:hover {
            color: red;
        }

    </style>
</head>
<body>
<div class="box">
    <ul style="margin: 10px;width: 110px">
        <li style="display: block;height: 27px;line-height: 25px;">
            <a href="#" target="_blank">aaa</a>
            <span style="font-size: 12px;margin: 0 2px;">/</span>
            <a href="#" target="_blank">aaa</a>
        </li>
        <li style="display: block;height: 30px;line-height: 30px;">
            <a href="#" target="_blank">aaa</a>
        </li>
        <li style="display: block;height: 30px;line-height: 30px;">
            <a href="#" target="_blank">aaa</a>
        </li>
        <li style="display: block;height: 30px;line-height: 30px;">
            <a href="#" target="_blank">aaa</a>
        </li>

    </ul>
</div>
</body>
</html>